A Guide To Power Electronics Design For Off-Battery Automotive (Part 1): EMC And Line Transient Requirements

Focus:

All vehicle original equipment manufacturers (OEMs) and most component suppliers to the OEMs perform tests to verify the electromagnetic compatibility (EMC) of their devices including conducted, radiated and electrostatic discharge (ESD) immunity. Engineers developing voltage regulator designs for embedded automotive applications should understand these requirements. Part 1 of this article series explains the immunity, ESD and supply-line transient requirements associated with conventional vehicle electrical systems, both 12 V and 24 V. It begins by identifying the CISPR and ISO standards that govern immunity performance at the vehicle, component and subassembly levels. It also calls out internal specifications required by the various automotive OEMs. The article then delves into the specific test requirements of ISO 16750-2 for power line quality (including waterfall, cold-crank and load-dump voltage transients), ISO 7637-2 for electrical transient conduction along supply lines, and ISO 11452 for narrowband RI and ISO 10605 for ESD immunity.

What you’ll learn:

• How to understand the requirements for conducted, radiated and ESD immunity in automotive electrical systems
• How to understand what immunity standards apply to automotive voltage regulator designs

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Author & Publication:

Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, May 13 2022

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